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Levine-Fricke-Recon <br /> ENGINEERS,WO 0OG OG STS AP Mo SpErvTiSTS <br /> Following construction, both wells will be developed to remove excessive sediment and to <br /> improve pumping performance. Development for both wells will be performed in one night shift a <br /> few days after well completion. All purge water from well development will be collected in a <br /> uailer-mounted storage tank and moved off site for disposal before the end of the work shift. <br /> Step Two: Installation and Start Up of the Groundwater Conveyance System <br /> Step two work will include the installation of the conveyance piping and electrical service trench <br /> across the Subject Property; installation of the two well vaults, pumps, and controls; and initial <br /> system startup. Field equipment for the trenching work will likely be limited to a rubber-tired <br /> backhoe and a small dump truck. Construction work will be performed only during nighttime <br /> hours, defined as between the hours of 8-00 p.m. and 7:00 a.m. At the end of each work shift, any <br /> waste materials or debris not otherwise described below will be removed, vehicles will be driven <br /> off site, and the work area will be compressed as much as possible. <br /> The planned alignment of the trenches has been adjusted to take full advantage of edges and <br /> expansion joints installed in the recently completed concrete pavement. As shown in Figure 1, the <br /> trenches will run near the edges of the pavement. Where necessary, the existing slab will be <br /> sawcut along the alignment of the trench before excavation. The trench construction sequence has <br /> been developed to allow the contractor to work as quickly as possible so that the overall disruption <br /> to the Subject Property is minimized. The trenches will be excavated to a depth of approximately <br /> 3 feet and will be temporarily covered with traffic-rated, steel trench plates. After the trenching is <br /> completed the plates will be lifted, piping and conduit will be laid in the trench, and the trench <br /> will be backfilled in one continuous operation. It is assumed that much of the excavated base rock <br /> will be reused as backfill material. <br /> Before conducting these intrusive construction activities, buried utilities that are present along the <br /> proposed pipeline will be located and discretely marked on the ground with paint to prevent any <br /> contact with utilities during trenching and pipeline installation. <br /> The 12-inch-diameter well boxes installed previously to complete the groundwater extraction wells <br /> will be removed and replaced with 4-foot-square utility vaults. An approximately 6-feet-square <br /> area will be excavated to install each vault. A sawcut square of this dimension will be made <br /> through the concrete slab to install the vaults for well GEW-007A and the expansion valve box. <br /> The vault excavation for well GEW-009A will be dug in the planter. The trench will be extended <br /> up to the edge of each vault and the pipeline and electrical service will be connected. All in-vault <br /> well pumps, pipes, valves, and wiring will then be installed. <br /> Once all trenches have been backfilled and the vaults installed, a replacement concrete slab will be <br /> installed to resurface the trenches. The replacement slab will match the existing slab, will be <br /> neatly edged to the vaults, and will be doweled and/or reinforced to maintain the integrity of the <br /> concrete slab. <br /> i,InA=,A Cf cvron-revmd 04111 SRL 3 <br /> STOitooz 'V S'.1 KO%:1M OLC9 Zt9 OTSQ tt:90 96ILZiSO <br />